Earlier quoted context omitted.
Or I could just click a dislike button and move on with my life, as is happening with my own posts
On HN there is a downvote button, but no block button, so its not a great comparison. If you just dislike someone on twitter, you would still see the user's new posts. If you dislike what they are saying in the present, do you still want to see what they're saying in the future?
You're thinking of this in too black or white. What if an author I follow posts something dumb? Do I then unfollow them? Why is it too much to ask to simply click dislike just like I would for something I like?